flag

flag n.  A variable or quantity that can take on one of two
   values; a bit, particularly one that is used to indicate one of two
   outcomes or is used to control which of two things is to be done.
   "This flag controls whether to clear the screen before printing
   the message."  "The program status word contains several flag
   bits."  Used of humans analogously to {bit}.  See also
   {hidden flag}, {mode bit}.



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